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Dataset Title:	(SECOORA) Glider - GOMECC2 - GOMECC-2 CTD profiles, 1-dbar bins, 93 files, one per station: Dissolved oxygen, temperature, salinity, and other variables measured from profile observations using CTD and other instruments from NOAA Ship Ronald H. Brown in the East Coast of the United States and Gulf of Mexico during the second Gulf of Mexico and East Coast Carbon (GOMECC-2) Cruise from 2012-07-24 to 2012-08-13 (NODC Accession 0117943)
Institution:	AOML (Dataset ID: axiom-netcdf-harvest-socan-RB-12-03-GOMECC2-1343098800-1344860760)
Range:	longitude = -90.809 to -68.515°E, latitude = 26.006 to 43.032°N, time = 2012-07-24T03:00:00Z to 2012-08-13T12:26:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  crs {
    Int32 actual_range -2147483647, -2147483647;
    String epsg_code "4326";
    String grid_mapping_name "latitude_longitude";
    Float64 inverse_flattening 298.257223563;
    String ioos_category "Unknown";
    String long_name "Coordinate Reference System";
    Float64 semi_major_axis 6378137.0;
  }
  dynamic_height {
    Float32 _FillValue -9999.9;
    Float32 actual_range 4.0e-5, 0.03051;
    String calculation_method_and_parameters "CTD";
    String cell_methods "time: point lon: point lat: point z: point";
    String coordinates "time latitude longitude z";
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "crs";
    String ioos_category "Unknown";
    String long_name "Dynamic Height";
    Float32 missing_value -9999.9;
    String observation_type "profile";
    String researcher_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String researcher_name "Molly Baringer";
    String standard_name "dynamic_height";
    String unit_id "19";
    String units "m";
    Float32 valid_max 1.0;
    Float32 valid_min 0.0;
    String variable_type "In-situ observation";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 _FillValue -9999.9;
    Float32 actual_range 26.006, 43.032;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Profile Location";
    Float32 missing_value -9999.9;
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 _FillValue -9999.9;
    Float32 actual_range -90.809, -68.515;
    String axis "X";
    String ioos_category "Location";
    String long_name "Profile Location";
    Float32 missing_value -9999.9;
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 180.0;
    Float32 valid_min -180.0;
  }
  oxygen {
    Float32 _FillValue -9999.9;
    Float32 actual_range 34.432, 320.368;
    String calculation_method_and_parameters "CTD";
    String cell_methods "time: point lon: point lat: point z: point";
    String coordinates "time latitude longitude z";
    String coverage_content_type "physicalMeasurement";
    String detailed_sampling_and_analyzing_information "A detailed and more complete description is available in the cruise report at: https://www.aoml.noaa.gov/ocd/gcc/GOMECC2/Cruise_Report_June2014.pdf. CTD/rosette casts were performed with a package consisting of a 24-place, 10-liter rosette frame (AOML?s white frame), a 24-place water sampler/pylon (SBE32) and 24, 10-liter Bullister/Niskin-style bottles. This package was deployed on all stations/casts. Underwater electronic components consisted of a Sea-Bird Electronics (SBE) 9 plus CTD with dual pumps and the following sensors: dual temperature (SBE3), dual conductivity (SBE4), dual dissolved oxygen (SBE43), and a Simrad 807 altimeter. The CTDs supplied a standard Sea-Bird format data stream at a data rate of 24 frames/second. The SBE9plus CTD was connected to the SBE32 24-place pylon providing for single-conductor sea cable operation. Power to the SBE9plus CTD, SBE32 pylon, auxiliary sensors, and altimeter was provided through the sea cable from the SBE11plus deck unit in the computer lab. Shipboard CTD data processing was performed automatically at the end of each deployment using SEABIRD SBE Data Processing version 7.21h and AOML Matlab processing software. ";
    String grid_mapping "crs";
    String ioos_category "Unknown";
    String long_name "Moles Of Oxygen Per Unit Mass In Sea Water";
    String method_reference "https://www.aoml.noaa.gov/ocd/gcc/GOMECC2/Cruise_Report_June2014.pdf";
    Float32 missing_value -9999.9;
    String observation_type "profile";
    String parameter_id "195";
    String researcher_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String researcher_name "Molly Baringer";
    String sampling_instrument "Sea-Bird SBE-911plus CTD system";
    String standard_name "moles_of_oxygen_per_unit_mass_in_sea_water";
    String uncertainty "Two SBE43 dissolved O2 (DO) sensors were used on this cruise. Both sensors tracked each other very well, with no noted problems. The DO sensors were calibrated to dissolved O2 check samples by matching the up cast bottle trips to down cast CTD data along isopycnal surfaces, calculating CTD dissolved O2, and then minimizing the residuals using a non-linear least-squares fitting procedure. The fitting determined calibration coefficients for the sensor model conversion equation and proceeded in a series of steps. Each sensor was fit in a separate sequence. The first step was to determine the time constants for the exponential terms in the model. These time constants are sensor-specific but applicable to an entire cruise. Once the time constants had been determined, casts were fit individually to O2 check sample data. The resulting calibration coefficients were then smoothed and held constant during a refit to determine sensor slope and offset. Calibration accuracy was examined by comparing O1-O2 over a range of station numbers and pressures (bottle trip locations) for each cast. For the entire cruise, only one set of oxygen sensors were used, both tracked each other extremely nicely. The two sensors show a median difference of -2.96 ?mol/kg and a pseudo standard deviation of 1.21 mol/kg.";
    String unit_id "57";
    String units "micromol.kg-1";
    String variable_type "In-situ observation";
  }
  platform {
    Int32 actual_range -2147483647, -2147483647;
    String call_sign "WTEC";
    String ioos_category "Unknown";
    String long_name "Platform Identifiers";
    String name "RONALD H. BROWN";
    String ncei_code "33RO";
    String wod_code "7603";
  }
  potential_temperature {
    Float32 _FillValue -9999.9;
    Float32 actual_range 1.803, 30.369;
    String calculation_method_and_parameters "CTD";
    String cell_methods "time: point lon: point lat: point z: point";
    String coordinates "time latitude longitude z";
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "crs";
    String ioos_category "Temperature";
    String long_name "Sea Water Potential Temperature";
    Float32 missing_value -9999.9;
    String observation_type "profile";
    String researcher_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String researcher_name "Molly Baringer";
    String sampling_instrument "Sea-Bird SBE-911plus CTD system";
    String standard_name "sea_water_potential_temperature";
    String unit_id "8";
    String units "degree_Celsius";
    String variable_type "In-situ observation";
  }
  profile {
    String cf_role "profile_id";
    String ioos_category "Unknown";
    String long_name "Profile Name";
  }
  salinity {
    Float32 _FillValue -9999.9;
    Float32 actual_range 30.322, 36.874;
    String calculation_method_and_parameters "CTD";
    String cell_methods "time: point lon: point lat: point z: point";
    String coordinates "time latitude longitude z";
    String coverage_content_type "physicalMeasurement";
    String detailed_sampling_and_analyzing_information "A detailed and more complete description is available in the cruise report at: https://www.aoml.noaa.gov/ocd/gcc/GOMECC2/Cruise_Report_June2014.pdf.CTD/rosette casts were performed with a package consisting of a 24-place, 10-liter rosette frame (AOML?s white frame), a 24-place water sampler/pylon (SBE32) and 24, 10-liter Bullister/Niskin-style bottles. This package was deployed on all stations/casts. Underwater electronic components consisted of a Sea-Bird Electronics (SBE) 9 plus CTD with dual pumps and the following sensors: dual temperature (SBE3), dual conductivity (SBE4), dual dissolved oxygen (SBE43), and a Simrad 807 altimeter. The CTDs supplied a standard Sea-Bird format data stream at a data rate of 24 frames/second. The SBE9plus CTD was connected to the SBE32 24-place pylon providing for single-conductor sea cable operation. Power to the SBE9plus CTD, SBE32 pylon, auxiliary sensors, and altimeter was provided through the sea cable from the SBE11plus deck unit in the computer lab. Shipboard CTD data processing was performed automatically at the end of each deployment using SEABIRD SBE Data Processing version 7.21h and AOML Matlab processing software. ";
    String grid_mapping "crs";
    String ioos_category "Salinity";
    String long_name "Salinity";
    String method_reference "https://www.aoml.noaa.gov/ocd/gcc/GOMECC2/Cruise_Report_June2014.pdf";
    Float32 missing_value -9999.9;
    String observation_type "profile";
    String parameter_id "50";
    String researcher_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String researcher_name "Molly Baringer";
    String sampling_instrument "Sea-Bird SBE-911plus CTD system";
    String standard_name "sea_water_practical_salinity";
    String uncertainty "Pressure sensor calibration coefficients derived from the pre-cruise calibrations were applied to raw pressure data during each cast. Residual pressure offsets (the difference between the first and last submerged pressures) were examined to check for calibration shifts. On deck pressure before the start of each cast was recorded. The on deck pressure before and after the cast were stable at 1.67 +/- 0.081 db, and 1.68 +/- 0.087 db respectively. Near surface pressure values (which are taken as the near-surface pressure at the markscan and the last fired bottle pressure) showed relatively small variability (4.41+/- 0.40 db before and 4.54+/- 0.33 db after).";
    String unit_id "4";
    String units "1e-3";
    String variable_type "In-situ observation";
  }
  specific_weight_gamma {
    Float32 _FillValue -9999.9;
    Float32 actual_range 0.992, 4338.979;
    String calculation_method_and_parameters "CTD";
    String cell_methods "time: point lon: point lat: point z: point";
    String coordinates "time latitude longitude z";
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "crs";
    String ioos_category "Unknown";
    String long_name "Specific Weight, Gamma";
    Float32 missing_value -9999.9;
    String observation_type "profile";
    String researcher_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String researcher_name "Molly Baringer";
    String standard_name "specific_weight_gamma";
    String units "N.m-3";
    String variable_type "In-situ observation";
  }
  temperature {
    Float32 _FillValue -9999.9;
    Float32 actual_range 2.112, 30.369;
    String calculation_method_and_parameters "CTD";
    String cell_methods "time: point lon: point lat: point z: point";
    String coordinates "time latitude longitude z";
    String coverage_content_type "physicalMeasurement";
    String detailed_sampling_and_analyzing_information "A detailed and more complete description is available in the cruise report at: https://www.aoml.noaa.gov/ocd/gcc/GOMECC2/Cruise_Report_June2014.pdf. CTD/rosette casts were performed with a package consisting of a 24-place, 10-liter rosette frame (AOML?s white frame), a 24-place water sampler/pylon (SBE32) and 24, 10-liter Bullister/Niskin-style bottles. This package was deployed on all stations/casts. Underwater electronic components consisted of a Sea-Bird Electronics (SBE) 9 plus CTD with dual pumps and the following sensors: dual temperature (SBE3), dual conductivity (SBE4), dual dissolved oxygen (SBE43), and a Simrad 807 altimeter. The CTDs supplied a standard Sea-Bird format data stream at a data rate of 24 frames/second. The SBE9plus CTD was connected to the SBE32 24-place pylon providing for single-conductor sea cable operation. Power to the SBE9plus CTD, SBE32 pylon, auxiliary sensors, and altimeter was provided through the sea cable from the SBE11plus deck unit in the computer lab. Shipboard CTD data processing was performed automatically at the end of each deployment using SEABIRD SBE Data Processing version 7.21h and AOML Matlab processing software. ";
    String grid_mapping "crs";
    String ioos_category "Temperature";
    String long_name "Sea Water Temperature";
    String method_reference "https://www.aoml.noaa.gov/ocd/gcc/GOMECC2/Cruise_Report_June2014.pdf";
    Float32 missing_value -9999.9;
    String observation_type "profile";
    String parameter_id "41";
    String researcher_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String researcher_name "Molly Baringer";
    String sampling_instrument "Sea-Bird SBE-911plus CTD system";
    String standard_name "sea_water_temperature";
    String uncertainty "Temperature sensor calibration coefficients derived from the pre-cruise calibrations were applied to raw primary and secondary temperature data during each cast.  Calibration accuracy was examined by comparing T1-T2 over a range of station numbers and pressures (bottle trip locations) for each cast. For the entire cruise, only one set of temperature sensors were used, both tracked each other extremely nicely. The median temperature difference between the two sensors was 0.0006 C with a pseudo standard deviation of 0.006 C.";
    String unit_id "8";
    String units "degree_Celsius";
    String variable_type "In-situ observation";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3430988e+9, 1.34486076e+9;
    String axis "T";
    String calendar "standard";
    String ioos_category "Time";
    String long_name "Sample Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  z {
    String _CoordinateAxisType "Height";
    Float32 _FillValue -9999.9;
    Float32 actual_range 1.0, 4358.0;
    String axis "Z";
    String calculation_method_and_parameters "CTD";
    String cell_methods "time: point lon: point lat: point z: point";
    String comment "depth was calculated from pressure using Sea-Bird Electronics document AN69, http://www.seabird.com/document/an69-conversion-pressure-depth";
    String coverage_content_type "physicalMeasurement";
    String detailed_sampling_and_analyzing_information "A detailed and more complete description is available in the cruise report at: https://www.aoml.noaa.gov/ocd/gcc/ECOA1/Cruise_Report_June2014.pdf. CTD/rosette casts were performed with a package consisting of a 24-place, 10-liter rosette frame (AOMLs yellow frame), a 24-place water sampler/pylon (SBE32) and 24, 10-liter Bullister/Niskin-style bottles. This package was deployed on all stations/casts. Underwater electronic components consisted of a Sea-Bird Electronics (SBE) 9 plus CTD with dual pumps and the following sensors: dual temperature (SBE3), dual conductivity (SBE4), dual dissolved oxygen (SBE43), and a Simrad 807 altimeter. The CTDs supplied a standard Sea-Bird format data stream at a data rate of 24 frames/second. The SBE9plus CTD was connected to the SBE32 24-place pylon providing for single-conductor sea cable operation. Power to the SBE9plus CTD, SBE32 pylon, auxiliary sensors, and altimeter was provided through the sea cable from the SBE11plus deck unit in the computer lab. The raw CTD data and bottle trips acquired by SBE Seasave on the Windows 7 workstation were processed from hex files to cnv files and then into bottle files.  Post cruise data processing was completed on a Windows 7 machine running SEABIRD SBE DATA Processing version 7.22.5";
    String grid_mapping "crs";
    String ioos_category "Location";
    String long_name "Depth";
    String method_reference "https://www.aoml.noaa.gov/ocd/gcc/ECOA1/Cruise_Report_June2014.pdf";
    Float32 missing_value -9999.9;
    String observation_type "profile";
    String parameter_id "186";
    String positive "down";
    String researcher_institution "Ocean Processes Analysis Laboratory, University of New Hampshire";
    String researcher_name "Joe Salisbury";
    String sampling_instrument "Sea-Bird SBE-911plus CTD system";
    String standard_name "depth";
    String unit_id "19";
    String units "m";
    Float32 valid_max 4360.0;
    Float32 valid_min 0.0;
    String variable_type "In-situ observation";
  }
 }
  NC_GLOBAL {
    String abstract "The second Gulf of Mexico and East Coast Carbon (GOMECC-2) Cruise on board the R/V Ronald H. Brown from Miami, took place in the Gulf of Mexico and then along the East US coast to Boston. The effort was in support of the coastal monitoring and research objectives of the NOAA Ocean Acidification Program (OAP). The cruise was designed to obtain a snapshot of key carbon, physical, and biogeochemical parameters as they relate to ocean acidification (OA) in the coastal realm. This was the second occupation, with the first occurring in 2007, and complemented mooring time series and other regional OA activities. The cruise included a series of 8 transects approximately orthogonal to the Gulf of Mexico and Atlantic coasts and a comprehensive set of underway measurements along the entire transect.";
    String cdm_altitude_proxy "z";
    String cdm_data_type "Profile";
    String cdm_profile_variables "profile";
    String contributor_name_1_address "4301 Rickenbacker Causeway, Miami, FL 33149, USA";
    String contributor_name_1_email "Rik.Wanninkhof@noaa.gov";
    String contributor_name_1_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String contributor_name_1_name "Rik Wanninkhof";
    String contributor_name_1_phone "305-361-4379";
    String contributor_name_1_role "PI";
    String contributor_name_2_address "4301 Rickenbacker Causeway, Miami, FL 33149, USA";
    String contributor_name_2_email "Molly.Baringer@noaa.gov";
    String contributor_name_2_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String contributor_name_2_name "Molly Baringer";
    String contributor_name_2_phone "305-361-4345";
    String Conventions "CF-1.6, ACDD-1.3";
    String creator_email "luc@axiomdatascience.com, rob@axiomdatascience.com";
    String creator_name "Axiom Data Science";
    String creator_url "http://www.axiomdatascience.com/";
    String cruise_id "RB-12-03 GOMECC2";
    String data_submitter_address "4301 Rickenbacker Causeway, Miami, FL 33149, USA";
    String data_submitter_email "Leticia.Barbero@noaa.gov";
    String data_submitter_institution "Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration";
    String data_submitter_name "Leticia Barbero";
    String data_submitter_phone "305-361-4453";
    String dataset_id "GOMECC2";
    String date_created "2018-03-20T21:52:01Z";
    String date_metadata_modified "2018-03-20T21:52:01Z";
    String date_submitted "2014-04-28T00:00:00.000-08:00";
    Float64 Easternmost_Easting -68.515;
    String expocode "33RO20120721";
    String featureType "Profile";
    String funding_agency_name "NOAA's Ocean Acidification Program";
    String geospatial_bounds "POLYGON ((-86.00099945068359 26.00600051879883, -89.99800109863281 27.58200073242188, -90.80899810791016 28.83399963378906, -70.54799652099609 43.03200149536133, -69.86199951171875 42.86199951171875, -69.00499725341797 42.47999954223633, -68.78299713134766 41.62599945068359, -68.51499938964844 37.86999893188477, -79.17400360107422 26.98800086975098, -79.20099639892578 26.98299980163574, -86.00099945068359 26.00600051879883))";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 43.032;
    Float64 geospatial_lat_min 26.006;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -68.515;
    Float64 geospatial_lon_min -90.809;
    String geospatial_lon_units "degrees_east";
    String geospatial_vertical_max "4358.0";
    String geospatial_vertical_min "1.0";
    String geospatial_vertical_positive "down";
    String geospatial_vertical_reference "mean_sea_level";
    String geospatial_vertical_units "meters";
    String grid_mapping_epsg_code "4326";
    Float64 grid_mapping_inverse_flattening 298.257223563;
    String grid_mapping_long_name "Coordinate Reference System";
    String grid_mapping_name "latitude_longitude";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    String history 
"NetCDF generated by Axiom from NCEI archived files
2025-07-01T07:13:25Z https://files.stage.platforms.axds.co/axiom/netcdf_harvest/socan/RB_12_03_GOMECC2_1343098800_1344860760/processed.nc
2025-07-01T07:13:25Z http://erddap.secoora.org/tabledap/axiom-netcdf-harvest-socan-RB-12-03-GOMECC2-1343098800-1344860760.das";
    String id "RB_12_03_GOMECC2";
    String infoUrl "https://portal.axds.co/?portal_id=47#platform/becdda5b-adfa-5df5-8fcf-c06597c32339/v2";
    String institution "AOML";
    String keywords "DISSOLVED OXYGEN, DYNAMIC HEIGHT, Potential temperature (theta), SALINITY, WATER TEMPERATURE";
    String keywords_vocabulary "GCMD Earth Science Keywords. Version 5.3.3";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    String Metadata_Conventions "Unidata Dataset Discovery v1.0";
    String metadata_link "https://www.nodc.noaa.gov/cgi-bin/OAS/prd/accession/117943";
    String naming_authority "gov.noaa.ncei";
    String ncei_accession_number "0117943";
    String ncei_template_version "NCEI_NetCDF_Profile_Incomplete_Template_v2.0";
    Float64 Northernmost_Northing 43.032;
    String packrat_source "axiom.netcdf_harvest.netcdf_harvest";
    String packrat_source_id "socan/RB_12_03_GOMECC2_1343098800_1344860760";
    String packrat_uuid "becdda5b-adfa-5df5-8fcf-c06597c32339";
    String platform "RV Ronald H. Brown";
    String platform_category "cruise";
    String platform_country "USA";
    String platform_ircs "WTEC";
    String platform_ncei "33RO";
    String platform_owner "NOAA";
    String platform_type "Research Vessel";
    String platform_wod "7603";
    String project "GOMECC2";
    String sea_name "East Coast - US/Canada, Gulf of Mexico";
    String source "AOML";
    String sourceUrl "https://files.stage.platforms.axds.co/axiom/netcdf_harvest/socan/RB_12_03_GOMECC2_1343098800_1344860760/processed.nc";
    Float64 Southernmost_Northing 26.006;
    String standard_name_vocabulary "NetCDF Climate and Forecast (CF) Metadata Convention Standard Name Table v46";
    String subsetVariables "latitude, longitude, profile, time, crs, platform";
    String summary "To measure key carbon, physical and biogeochemical parameters in coastal waters of the Gulf of Mexico and eastern coast of the US in relation to Ocean Acidification.";
    Float64 time_coverage_duration 1.76196e+9;
    String time_coverage_end "2012-08-13T12:26:00Z";
    String time_coverage_start "2012-07-24T03:00:00Z";
    String title "(SECOORA) Glider - GOMECC2 - GOMECC-2 CTD profiles, 1-dbar bins, 93 files, one per station: Dissolved oxygen, temperature, salinity, and other variables measured from profile observations using CTD and other instruments from NOAA Ship Ronald H. Brown in the East Coast of the United States and Gulf of Mexico during the second Gulf of Mexico and East Coast Carbon (GOMECC-2) Cruise from 2012-07-24 to 2012-08-13 (NODC Accession 0117943)";
    String urn "urn:ioos:station:gov.noaa.ncei:RB_12_03_GOMECC2";
    String vessel_name "RV Ronald H. Brown";
    Float64 Westernmost_Easting -90.809;
  }
}

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its selection constraints (external link)

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

(easy) You can get data by using the dataset's Data Access Form or Subset form. They make the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.